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I couldn't find any discussions about this scenario here, so I'm offering material from Hero's Corner. I practically went through it in a similar way. However, Ilaya's development was somewhat different; she didn't use light magic, which made her a rather alternative Warlock, and this caused a number of problems in the 5th mission. (see illustration)
Original: http://heroes.ag.ru/heroes5/campaigns/a1/c3/m4
Mission Objectives:
- Hold the city
- Defeat Tralsai's army
- Ylaya must survive
- Isabel must survive
- Raelag must survive
- Ilaya must find the dragon lair and gain their support